/*
 * Copyright (c) 2012, marco.tamburelli@gmail.com
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met: 
 * 
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer. 
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution. 
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.bmi.gwt.mi.server.impl;

import java.lang.reflect.Constructor;
import java.security.InvalidParameterException;
import java.util.HashMap;

import org.bmi.gwt.mi.server.util.ServerUtil;
import org.bmi.gwt.mi.shared.MiObject;
import org.bmi.gwt.mi.shared.communication.ptypes.Param;
import org.bmi.gwt.mi.shared.util.ObjectWrapper;
import org.bmi.gwt.mi.shared.util.WrapperFactory;

public class WrapperFactoryServer implements WrapperFactory
{
	private HashMap<String, ConstructorHelper> helpers = new HashMap<String, ConstructorHelper>();

	/**
	 * Class which associates constructors to its signature.
	 */
	private class ConstructorHelper
	{
		HashMap<String, Constructor<? extends MiObject>> constrMap = new HashMap<String, Constructor<? extends MiObject>>();
		Class<? extends MiObject> objectClass;

		@SuppressWarnings("unchecked")
		ConstructorHelper(Class<? extends MiObject> objectClass)
		{
			this.objectClass = objectClass;

			for (Constructor<?> constr : objectClass.getConstructors())
				this.constrMap.put(ServerUtil.getJNISignature(constr.getParameterTypes()),
						(Constructor<? extends MiObject>) constr);
		}

		Constructor<? extends MiObject> getConstructor(String signature)
		{
			Constructor<? extends MiObject> constr = this.constrMap.get(signature);

			if (constr == null)
				throw new InvalidParameterException("Constructor '" + signature + "' for class "
						+ this.objectClass.getCanonicalName() + " doesn't exists.");

			return constr;
		}
	}

	@Override
	public <T extends MiObject> ObjectWrapperServer createWrapper(T miObject)
	{
		ObjectWrapperServer wrapper = new ObjectWrapperServer();
		wrapper.setInstance(miObject);

		return wrapper;
	}

	@Override
	public ObjectWrapper createWrapper(Class<? extends MiObject> objectClass, String signature,
			HashMap<String, ObjectWrapper> objectMap, Param<?>[] args) throws Exception
	{
		ObjectWrapperServer wrapper = new ObjectWrapperServer();

		ConstructorHelper helper = this.helpers.get(objectClass.toString());

		if (helper == null)
		{
			helper = new ConstructorHelper(objectClass);
			this.helpers.put(objectClass.toString(), helper);
		}

		Constructor<? extends MiObject> constr = helper.getConstructor(signature);
		wrapper.setInstance(constr.newInstance(ParamConverter.convertParameters(objectMap, args,
				constr.getParameterTypes())));

		return wrapper;
	}

	@Override
	public ObjectWrapper createWrapper(String targetClassName, String signature,
			HashMap<String, ObjectWrapper> objectMap, Param<?>[] args) throws Exception
	{
		@SuppressWarnings("unchecked")
		Class<? extends MiObject> clazz = (Class<? extends MiObject>) Class.forName(targetClassName);
		return createWrapper(clazz, signature, objectMap, args);
	}

	@Override
	public ObjectWrapper createWrapper(Class<? extends MiObject> objectClass, String signature,
			HashMap<String, Object> returnValuesMap, HashMap<String, ObjectWrapper> objectMap, Param<?>[] args)
			throws Exception
	{
		ObjectWrapperServer wrapper = new ObjectWrapperServer();

		ConstructorHelper helper = this.helpers.get(objectClass.toString());

		if (helper == null)
		{
			helper = new ConstructorHelper(objectClass);
			this.helpers.put(objectClass.toString(), helper);
		}

		Constructor<? extends MiObject> constr = helper.getConstructor(signature);
		wrapper.setInstance(constr.newInstance(ParamConverter.convertParameters(returnValuesMap, objectMap, args,
				constr.getParameterTypes())));

		return wrapper;
	}

	@Override
	public ObjectWrapper createWrapper(String targetClassName, String signature,
			HashMap<String, Object> returnValuesMap, HashMap<String, ObjectWrapper> objectMap, Param<?>[] args)
			throws Exception
	{
		@SuppressWarnings("unchecked")
		Class<? extends MiObject> clazz = (Class<? extends MiObject>) Class.forName(targetClassName);
		return createWrapper(clazz, signature, returnValuesMap, objectMap, args);
	}
}
